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YOSHIKAZU OHNO, AKIO FUJIWARA, PHOTOINHIBITION OF ELONGATION GROWTH OF ROOTS IN RICE SEEDLINGS, Plant and Cell Physiology, Volume 8, Issue 1, March 1967, Pages 141–150, https://doi.org/10.1093/oxfordjournals.pcp.a079235
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Abstract
Effects of white, blue, red and far-red lights on the elongation growth of intact primary roots in rice seedlings were investigated. White light inhibited elongation of root cells. Blue light inhibited both cell elongation and cell multiplication, but red light inhibited only cell elongation. The effect of far-red light was almost the same as that of the red. The lights exerted; the same effects on the growth of primary roots irrespective of age of the seedlings. The inhibitory effects of the lights were also observed when the root of the deshooted seedlings was irradiated, but not when only the shoot of the seedlings was irradiated. It was inferred that it is not the shoot but the root which responds to the light in this phenomenon. DCMU hardly affected root growth at a concentration so high as to inhibit strongly photosynthesis in the shoot. The possibility that photosynthesis participates directly in the photoinhibition of root growth in rice seedlings was excluded.
